<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>

      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTableave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传区域 -->
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">
                只能上传jpg/png文件，且不超过500kb
              </div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
//导入lodash
import _ from 'lodash'

export default {
  data() {
    return {
      // 步骤条默认激活 与左侧Tab联动
      activeIndex: '0',

      //添加商品的表单对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述内容
        goods_introduce: '',
        //商品详细描述
        attrs: []
      },

      //添加商品表单的验证规则
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true,
            message: '请选择商品分类',
            trigger: 'blur'
          }
        ]
      },

      //商品分类列表
      cateList: [],

      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },

      //动态参数列表
      manyTableData: [],

      //静态属性列表
      onlyTableData: [],

      //上传图片的URL地址
      uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',

      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },

      //图片路径
      previewPath: '',

      //控制图片预览对话框显示与隐藏
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }

      this.cateList = res.data
      console.log('cateList ==>', this.cateList)
    },

    //级联选择器选择项变化触发此函数
    handleChange() {
      console.log('this.addForm.goods_cat ==>', this.addForm.goods_cat)

      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },

    beforeTableave(activeName, oldActiveName) {
      // console.log("即将离开的标签页名字是:" + oldActiveName);
      // console.log("即将进入的标签页名字是:" + activeName);

      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
    },

    async tabClicked() {
      //   console.log("this.activeIndex ==>", this.activeIndex);
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败!')
        }

        // console.log('res.data ===>', res.data)

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })

        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败!')
        }

        this.onlyTableData = res.data
      }
    },

    //处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url

      this.previewVisible = true
    },

    //处理移除图片的操作
    handleRemove(file) {
      console.log('file ===>', file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path

      //2.从pics数组中,找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)

      // 3.调用数组的 splice 方法 把图片信息对象 从pics数组中移除
      this.addForm.pics.splice(i, 1)

      console.log('this.addForm =====>', this.addForm)
    },

    //监听图片上传成功的事件
    handleSuccess(response) {
      console.log('response ===>', response)

      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }

      // 2.将图片信息对象, push 到 pics数组中
      this.addForm.pics.push(picInfo)
      console.log('this.addForm ===>', this.addForm)
    },

    //添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }

        //lodash  深拷贝   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        // console.log("form ===>", form);

        //处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }

          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }

          this.addForm.attrs.push(newInfo)
        })

        form.attrs = this.addForm.attrs
        console.log('form ===>', form)

        //发起请求添加商品
        //商品名称必须唯一性
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }

        this.$message.success('添加商品成功!')

        this.$router.push('/goods')
      })
    }
  },

  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.el-button--primary {
  margin-top: 20px;
}
</style>
